Servo assisted butterfly valve provided with a flat leaf...

Valves and valve actuation – Electrically actuated valve – Rotary electric actuator

Reexamination Certificate

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Details

C251S286000

Reexamination Certificate

active

07028979

ABSTRACT:
A servo-assisted butterfly valve comprising a valve body, a valve seat formed in the valve body, a butterfly disc adapted to engage the valve seat, a shaft on which the butterfly disc is keyed, an electric motor coupled to the shaft by means of at least one toothed wheel provided with a projection, a spiral return spring adapted to rotate the butterfly disc towards the closed position, and an opposing spring adapted to rotate the butterfly disc towards a limp-home position defined by an abutment body against the action of the return spring; the opposing spring is a flat leaf spring and is mounted on a moving member which is mounted coaxially and idly on the shaft and comprises a projection adapted to engage in abutment against the abutment body, a first end of the opposing spring being free and adapted to come into contact with the projection of the toothed wheel during the rotation of this toothed wheel.

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Search Report for European Application No. EP 04 10 4443 (Dec. 8, 2004).

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